Support for importing relation objects by ID from json file

[omidraha]

Hi,

The createOrUpdateAllFromJson method or similar other methods,
support for importing objects by putting only id for relation objects,
instead of putting whole object data on the json file.

For example when we have these two Dog and Person models:

public class Dog extends RealmObject {
    @PrimaryKey
    private int id;
    private String name;

}

public class Person extends RealmObject {
    @PrimaryKey
    private int id;
    private String name;
    private RealmList<Dog> dogs;

}

And assumed we currently have these records on the Dog model on the database:

Now, we want to able to import Person model from this Person.json file:

[{"id":1, "name": "Jane", "dogs": [1,2]]

Instead of this Person.json file:

[{"id":1, "name": "Jane", "dogs": [{"id": 1, "name": "Fido"}, {"id": 2, "name": "Fluffy"}]

by doing:

InputStream stream = getAssets().open("Person.json");
Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
realm.createOrUpdateAllFromJson(Person.class, stream);
realm.commitTransaction();

[cmelchior]

Yes, a similar idea has been raised here as well: #3758. Personally, I find the idea compelling and would definitely ease integration with a lot of REST API's that just send ID's.

[hardysim]

I've just created #6666 before finding this but it seems we're having the same problem. Maybe you can use the workaround mentioned there until realm adds this functionality.